This is a small usability feature to simplify adding additional inputs in the
Index Switch and Menu Switch nodes without having to go to the sidebar.
Technically, something similar can be done for other extend-sockets. However,
here it works best, because one does not have to choose the socket type. For
other inputs we could use a quick popup when pressing the button, but that seems
outside of the scope of this patch.
Later we might also want add the ability to remove existing inputs. But just
adding an icon for that doesn't work so well for socket types that have an input
property.
Co-authored-by: Brady Johnston <36021261+BradyAJohnston@users.noreply.github.com>
Pull Request: https://projects.blender.org/blender/blender/pulls/145915
25c84e90df